■ Tea party challenges could stir up GOP's Mackinac conference: The 30th Biennial Mackinac Republican Leadership Conference will open amid improving poll numbers for Gov. Rick Snyder and a decent chance for the GOP to win its first U.S. Senate seat since 1994. But it also will include a tea party challenge to Lt. Gov. Brian Calley that could set up an ugly floor fight at next year’s state convention. - By Paul Egan, Detroit Free Press Lansing Bureau

■ Michigan bills let agencies refuse adoptions due to morals: Lawmakers could vote this week on bills letting faith-based agencies refuse to participate in adoptions that violate their beliefs, despite accusations that they would permit discrimination against gays and others. - By David Eggert, The Associated Press

■ Bus bound for Detroit overturns in Ohio; 35 injured: A Greyhound bus drove off an interstate highway in southwest Ohio early Saturday, struck a tree and a fence and flipped on its side before sliding to a stop in a cornfield, injuring at least 35 people. - By Lisa Cornwell, The Associated Press